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Memory storage and bit density

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A hard disk contains four Platters. Each side of the platter is coated with a magnetic oxide, allowing data to be stored on it. The platters are 3.5 inches in diameter. If the hard disk has a capacity of 800 GB and 80% of the platter surface is used for data storage, what is the bit density per square inch?

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Step by step computations shown along with explanation.

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Since the hard disk contains four platters and each side of the platter is used for storing data on it, we have in total (4*2), that is, 8 platter side surfaces to store the data.

As the platters are 3.5 inches in diameter, surface area of one side of the platter = (22/7)*(3.5*3.5)/4 [Using ...

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